thank you for mentioning kinokoteikoku, i love them but haven't seen anyone mention them in forever.
i know more about indie / alt rock than math rock but
polkadot stingray are a very popular indie band, but they're pretty far removed from math rock
vivid undress are more alty but i like them a lot
itsue i think best fit the style of what you're looking for. itsue and vivid undress both broke up a while ago, but itsue's vocalist mizuki is still active under the alias unidots. i think itsue >>>> unidots but you might like it.
also they don't do as much rock anymore, it's more alt / experimental, but my favorite band ever is called yorushika if you haven't given them a listen yet